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The ultimate sound: BOOM 4 portable waterproof Bluetooth speaker delivers rich 360-degree sound and deep, accurate bass, all carefully balanced to let you hear every note Optimized for adventure: This waterproof portable speaker features a rechargeable battery that stays charged and streams tunes for up to 15 hours on a single charge A waterproof Bluetooth speaker designed for outdoors: rated IPX7 waterproof and drop resistant up to 1.5 m, the BOOM 4 floating Bluetooth speaker is virtually indestructible PartyUp: Use PartyUp on the Ultimate Ears BOOM app to pair multiple portable Bluetooth speakers BOOM, MEGABOOM, EVERBOOM, EPICBOOM and HYPERBOOM, and create the ultimate surround sound experience Magic Button: play, pause, next track and control your streaming service; set up playlists with one click on platforms like Spotify, Amazon Music on Android or Apple Music on iOS Strongly wireless: With a range of 45 m, you can get away from your BOOM 4 wireless speaker while still listening to music. Made with recycled plastic: The plastic parts of the Ultimate Ears BOOM 4 Wireless Bluetooth Speaker contain at least 52% post-consumer recycled plastic by weight